Nitrate, ammonium, and DON mass time series output for East River stream, vadose zone and groundwater subwatersheds from HAN-SoMo model

There is a growing understanding of the role that bedrock weathering can play as a source of nitrogen (N) to soils, groundwater and river systems. The significance is particularly apparent in mountainous environments where weathering fluxes can be large. However, our understanding of the relative contributions of rock-derived, or geogenic, N to the total N supply of mountainous watersheds remains poorly understood. This dataset contains model output from the High-Altitude Nitrogen Suite of Models (HAN-SoMo), a watershed-scale ensemble of process-based models to quantify the relative sources, transformations, and sinks of geogenic and atmospheric N through a mountain watershed. Our study is based in the East River Watershed (ERW) in the Upper Colorado River Basin. The East River is a near-pristine headwater watershed underlain primarily by an N-rich Mancos Shale bedrock, enabling the timing and magnitude of geogenic and atmospheric contributions to watershed scale dissolved N-exports to be quantified. Six calibration scenarios were developed to explore equifinality using >1600 N concentration measurements from streams, groundwater, and vadose zone samples collected over the course of four years across the watershed, from 2014-2018. The files in this dataset are named according to which calibration scenario they represent (1, 2, 3, NM1, NM2, and NC), and include daily time series model output of nitrate, ammonium and dissolved organic nitrogen concentrations for all six calibration scenarios described in Maavara et al., 2021, "Modeling geogenic and atmospheric nitrogen through the East River Watershed, Colorado Rocky Mountains," PLOS One (in press), for the stream, vadose zone, and groundwater in the five discretized subwatersheds: Rustlers Gulch, Copper Creek, East above Quigley (EAQ), the Middle East River (ME), and Lower Triangle (LT) from Gothic to the Pumphouse. The READ_ME.txt file includes details on units and naming conventions in each of these files. Model files are in .mat format, to be opened in MATLAB.

学界已逐渐认识到基岩风化作为氮（N）输入土壤、地下水与河流系统的重要作用。该作用在山地环境中尤为显著，因其风化通量往往规模可观。然而，当前学界对岩石衍生（即地质成因）氮在山地流域总氮供给中的相对贡献仍缺乏深入认知。本数据集包含高海拔氮模拟套件（High-Altitude Nitrogen Suite of Models, HAN-SoMo）的模型输出结果，该套件是一套流域尺度的过程集合模型，用于量化山地流域内地质成因与大气来源氮的相对来源、转化过程及汇通量。本研究的研究区域为科罗拉多河上游流域的东河流域（East River Watershed, ERW），该东河属于近乎原始的源头流域，基底岩性以富氮的曼科斯页岩（Mancos Shale）为主，这使得我们能够量化地质成因与大气来源氮对流域尺度溶解态氮输出的时间特征与总量规模。研究团队共设计6种校准情景，借助2014至2018年四年间在全流域采集的逾1600组溪流、地下水及包气带样品的氮浓度测量数据，开展等效性（equifinality）分析。本数据集内的文件以其所对应的校准情景命名（分别为1、2、3、NM1、NM2与NC），包含Maavara等人2021年发表于《PLOS ONE》（已录用）的论文《Modeling geogenic and atmospheric nitrogen through the East River Watershed, Colorado Rocky Mountains》中提及的全部6种校准情景的日时间序列模型输出，涵盖5个离散子流域：拉斯勒峡谷（Rustlers Gulch）、铜溪（Copper Creek）、奎格利河东段（EAQ, East above Quigley）、中东河（ME, Middle East River）以及从哥特镇到泵房的下三角流域（LT, Lower Triangle from Gothic to the Pumphouse）内溪流、包气带与地下水中的硝酸盐、铵盐及溶解态有机氮浓度。数据集附带的READ_ME.txt文件详细说明了各文件的单位与命名规范。所有模型文件均为.mat格式，需使用MATLAB软件打开。